This is what Holly Madison’s boyfriend looks like. He’s All Time Low guitarist Jack Barakat. They hung at Lavo restaurant with friend Angel Porrino. Courtesy photos by Al Powers.

And here's Holly, courtesy photo by Denise Truscello.

Rihanna in red counted down at club Pure. She brought 10 friends, family and security, and obviously ex-boyfriend Matt Kemp of the Dodgers wasn't there. Courtesy photo by David Becker/Wire Image.

At Hard Rock, Ludacris was at Vanity with friends and family, and performed seven songs: "All I Do is Win," "Stand Up," "Yeah!", "Glamorous," "Lick You From Your Head to Your Toes," "How Low" and "Move Bitch." Also there: Jason Giambi and wife. Courtesy photos by Hew Burney.

Dennis Quaid and wife Kimberly went to Nobo then Skybar, at Hard Rock, where they ran into Miss Nevada Sarah Chapman. Julia Jones of "Twilight" is staying at Hard Rock. Eating at Nobo last night: Chad Kroeger of Nickelback. And Pete Wentz at at Johnny Smalls without wife Ashlee Simpson. Courtesy photo Hard Rock.